Outputs (4)

A second view on the X-ray polarization of NGC 4151 with IXPE (2024)
Journal Article
Gianolli, V. E., Bianchi, S., Kammoun, E., Gnarini, A., Marinucci, A., Ursini, F., Parra, M., Tortosa, A., De Rosa, A., Kim, D. E., Marin, F., Matt, G., Serafinelli, R., Soffitta, P., Tagliacozzo, D., Di Gesu, L., Done, C., Marshall, H. L., Middei, R., Mikusincova, R., …Tombesi, F. (2024). A second view on the X-ray polarization of NGC 4151 with IXPE. Astronomy & Astrophysics, 691, Article A29. https://doi.org/10.1051/0004-6361/202451645

We report on the second observing program of the active galactic nucleus NGC 4151 with simultaneous Imaging X-ray Polarimetry Explorer (IXPE; 750 ks), NuSTAR (∼60 ks), XMM-Newton (∼75 ks), and NICER (∼65 ks) pointings. NGC 4151 is the first Type-1 ra... Read More about A second view on the X-ray polarization of NGC 4151 with IXPE.

HYPerluminous quasars at the Epoch of ReionizatION (HYPERION): A new regime for the X-ray nuclear properties of the first quasars (2023)
Journal Article
Zappacosta, L., Piconcelli, E., Fiore, F., Saccheo, I., Valiante, R., Vignali, C., …Vanzella, E. (2023). HYPerluminous quasars at the Epoch of ReionizatION (HYPERION): A new regime for the X-ray nuclear properties of the first quasars. Astronomy & Astrophysics, 678, Article A201. https://doi.org/10.1051/0004-6361/202346795

The existence of luminous quasars (QSOs) at the epoch of reionization (EoR; i.e., z > 6) powered by well-grown supermassive black holes (SMBHs) with masses ≳109 M⊙ challenges models of early SMBH formation and growth. To shed light on the nature of t... Read More about HYPerluminous quasars at the Epoch of ReionizatION (HYPERION): A new regime for the X-ray nuclear properties of the first quasars.

Wavelength dependences of the optical/UV and X-ray luminosity correlations of quasars (2023)
Journal Article
Ward, M., Done, C., Jin, C., Lusso, E., & Middei, R. (2024). Wavelength dependences of the optical/UV and X-ray luminosity correlations of quasars. Monthly Notices of the Royal Astronomical Society, 527(1), 356–373. https://doi.org/10.1093/mnras/stad3193

The interband correlations between optical/ultraviolet (UV) and X-ray luminosities of active galactic nuclei (AGNs) are important
for understanding the disc–coronal connection, as well as using AGN as standard candles for cosmology. It is convention... Read More about Wavelength dependences of the optical/UV and X-ray luminosity correlations of quasars.

Tracking the spectral properties of ESO 511-G030 across different epochs (2023)
Journal Article
Middei, R., Petrucci, P., Bianchi, S., Ursini, F., Matzeu, G. A., Vagnetti, F., …Done, C. (2023). Tracking the spectral properties of ESO 511-G030 across different epochs. Astronomy & Astrophysics, 672, 1-17. https://doi.org/10.1051/0004-6361/202244022

The Type 1 active galactic nucleus (AGN) ESO 511-G030, a formerly bright and soft excess dominated source, was observed in 2019 in the context of a multi-wavelength monitoring campaign. In the new exposures, the source was found to be in a flux state... Read More about Tracking the spectral properties of ESO 511-G030 across different epochs.